@mixin czp($a, $b:all) {
    transition: $a $b;
    -webkit-transition: $a $b;
    -moz-transition: $a $b;
}

.box1 {
    @include czp(1s, all);
}

.box2 {
    @include czp(2s);
}

.box3 {
    @include czp(3s, width);
}